Can Payment processing integrate with KSA B2B Banks APIs specifications including Signature?

Summary:

We have a need to integrate with Bank to send Payments transactions and Payroll and inquiry about the execution of each call for many times till we get a final processing result for all transactions, We found that Fusion supports payments transmission but not clear how can we get final statuses of transactions submitted and how we can retry failures or take specific actions in case of failures?
Also, Does it support signing specific part of message and include it in the payload with private key and how to achieve this if it supports that?

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